Quad as a word or prefix usually means 4. It may refer to:
Government Quadrilateral Security Dialogue, a strategic security dialogue between Australia, India, Japan, and the United States Quadrilateral group, an informal group that includes the trade spokesmen of the United States, Japan, Canada, and the European Union I2U2 Group, a strategic partnership between the United States, India, Israel, and United Arab Emirates; also known as the "Middle East Quad" Quad Cities, a group of five cities straddling the boundary between the U.S. states of Iowa and Illinois The "Quad", the senior members of the Cameron–Clegg coalition government in the United Kingdom from 2010 to 2015
Art and entertainment Matthias Quad (1557–1613), engraver and cartographer working in Germany Quad (film), 2020 Quad (music), a musical project by Gary Ramon Quad (play), by Samuel Beckett The Quad (TV series), 2017 Quad (arts centre), in Derby, United Kingdom Quad Cinema, art house in New York City, New York Quad (studio), a Japanese animation studio
Business
Quad (company), an American marketing solutions company Quad Electroacoustics, a British manufacturer of audio equipment
Medicine and anatomy Quadriplegic, a person paralyzed in all four limbs Quadriceps, a large leg muscle group Quadruplets, four children from a multiple birth
Sports Quad (figure skating), a figure skating jump with four revolutions Quad scull, a boat configuration of four rowers Quad skates, roller skates with two wheels on each of two axles Quad, one of the divisions in wheelchair tennis Quadruple-double, a statistical accomplishment in basketball Quadrennium, the 4-year training cycle between Olympic games
Transportation Quad bike or all-terrain vehicle, a light off-road vehicle Quad, a tandem bicycle with four seats Quadracycle, a four-wheeled human-powered land vehicle Jeffery Quad, a four-wheel drive truck Quadcopter, a four-rotor helicopter Quad, a chairlift in skiing which carries four persons Quad, or railroad speeder, a motorized vehicle used for maintenance on railroads Quad (rocket), an autonomous rocket by Armadillo Aerospace
Technology QUAD (cipher), a stream cipher QUaD, a microwave telescope at the South Pole Quad antenna, a directional antenna Quadraphonic sound, four-channel sound Quadruplex videotape, video tape format Quad flat package, a type of package for surface mounted integrated circuits Star quad cable, four insulated conductors twisted together
Other uses Quad (unit), unit of energy, short for quadrillion, 1015 BTU Quad (geography), a United States Geological Survey topographical map Quad (typography), a spacer used in letterpress type Quad poster, a common UK size of film poster Quadrangle (architecture), a space or courtyard bordered by buildings Quadrat, in ecology, a small study area or a frame used to define it Quadrilateral, in geometry Quadrupel, a Belgian beer Quadruple combination, the four books that comprise the canon of the LDS church The Quad Casino (now The Linq), on the Las Vegas Strip Four-of-a-kind in poker Sako Quad, a Finnish bolt-action rifle Morris C8, a WWII era artillery tractor
See also Quadrangle (disambiguation)